<?php
/*
* $Id$
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.phpdoctrine.org>.
*/
Doctrine::autoload('Doctrine_Query_Abstract');
/**
* Doctrine_Query
* A Doctrine_Query object represents a DQL query. It is used to query databases for
* data in an object-oriented fashion. A DQL query understands relations and inheritance
* and is dbms independant.
*
* @package Doctrine
* @subpackage Query
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @link www.phpdoctrine.org
* @since 1.0
* @version $Revision$
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
* @todo Proposal: This class does far too much. It should have only 1 task: Collecting
* the DQL query parts and the query parameters (the query state and caching options/methods
* can remain here, too).
* The actual SQL construction could be done by a separate object (Doctrine_Query_SqlBuilder?)
* whose task it is to convert DQL into SQL.
* Furthermore the SqlBuilder? can then use other objects (Doctrine_Query_Tokenizer?),
* (Doctrine_Query_Parser(s)?) to accomplish his work. Doctrine_Query does not need
* to know the tokenizer/parsers. There could be extending
* implementations of SqlBuilder? that cover the specific SQL dialects.
* This would release Doctrine_Connection and the Doctrine_Connection_xxx classes
* from this tedious task.
* This would also largely reduce the currently huge interface of Doctrine_Query(_Abstract)
* and better hide all these transformation internals from the public Query API.
*
* @internal The lifecycle of a Query object is the following:
* After construction the query object is empty. Through using the fluent
* query interface the user fills the query object with DQL parts and query parameters.
* These get collected in {@link $_dqlParts} and {@link $_params}, respectively.
* When the query is executed the first time, or when {@link getSqlQuery()}
* is called the first time, the collected DQL parts get parsed and the resulting
* connection-driver specific SQL is generated. The generated SQL parts are
* stored in {@link $_sqlParts} and the final resulting SQL query is stored in
* {@link $_sql}.
*/
class Doctrine_Query extends Doctrine_Query_Abstract implements Countable, Serializable
{
/**
* @var array
*/
protected $_subqueryAliases = array();
/**
* @var array $_aggregateAliasMap an array containing all aggregate aliases, keys as dql aliases
* and values as sql aliases
*/
protected $_aggregateAliasMap = array();
/**
* @param boolean $needsSubquery
*/
protected $_needsSubquery = false;
/**
* @param boolean $isSubquery whether or not this query object is a subquery of another
* query object
*/
protected $_isSubquery;
/**
* @var array $_neededTables an array containing the needed table aliases
*/
protected $_neededTables = array();
/**
* @var array
*/
protected $_expressionMap = array();
/**
* @var string $_sql cached SQL query
*/
protected $_sql;
protected $_dql;
/**
* create
* returns a new Doctrine_Query object
*
* @param Doctrine_Connection $conn optional connection parameter
* @return Doctrine_Query
*/
public static function create($conn = null)
{
return new Doctrine_Query($conn);
}
/**
* Resets the query to the state just after it has been instantiated.
*/
public function reset()
{
$this->_neededTables = array();
$this->_expressionMap = array();
$this->_subqueryAliases = array();
$this->_needsSubquery = false;
$this->_isLimitSubqueryUsed = false;
}
/**
* createSubquery
* creates a subquery
*
* @return Doctrine_Hydrate
*/
public function createSubquery()
{
$class = get_class($this);
$obj = new $class();
// copy the aliases to the subquery
$obj->copyAliases($this);
// this prevents the 'id' being selected, re ticket #307
$obj->isSubquery(true);
return $obj;
}
/**
* addEnumParam
* sets input parameter as an enumerated parameter
*
* @param string $key the key of the input parameter
* @return Doctrine_Query
*/
public function addEnumParam($key, $table = null, $column = null)
{
$array = (isset($table) || isset($column)) ? array($table, $column) : array();
if ($key === '?') {
$this->_enumParams[] = $array;
} else {
$this->_enumParams[$key] = $array;
}
}
/**
* getEnumParams
* get all enumerated parameters
*
* @return array all enumerated parameters
*/
public function getEnumParams()
{
return $this->_enumParams;
}
/**
* getDql
* returns the DQL query that is represented by this query object.
*
* the query is built from $_dqlParts
*
* @return string the DQL query
*/
public function getDql()
{
if ($this->_dql !== null) {
return $this->_dql;
}
$q = '';
$q .= ( ! empty($this->_dqlParts['select']))? 'SELECT ' . implode(', ', $this->_dqlParts['select']) : '';
$q .= ( ! empty($this->_dqlParts['from']))? ' FROM ' . implode(' ', $this->_dqlParts['from']) : '';
$q .= ( ! empty($this->_dqlParts['where']))? ' WHERE ' . implode(' AND ', $this->_dqlParts['where']) : '';
$q .= ( ! empty($this->_dqlParts['groupby']))? ' GROUP BY ' . implode(', ', $this->_dqlParts['groupby']) : '';
$q .= ( ! empty($this->_dqlParts['having']))? ' HAVING ' . implode(' AND ', $this->_dqlParts['having']) : '';
$q .= ( ! empty($this->_dqlParts['orderby']))? ' ORDER BY ' . implode(', ', $this->_dqlParts['orderby']) : '';
$q .= ( ! empty($this->_dqlParts['limit']))? ' LIMIT ' . implode(' ', $this->_dqlParts['limit']) : '';
$q .= ( ! empty($this->_dqlParts['offset']))? ' OFFSET ' . implode(' ', $this->_dqlParts['offset']) : '';
return $q;
}
/**
* getParams
*
* @return array
*/
public function getParams()
{
return array_merge($this->_params['join'], $this->_params['set'], $this->_params['where'], $this->_params['having']);
}
/**
* setParams
*
* @param array $params
*/
public function setParams(array $params = array()) {
$this->_params = $params;
}
/**
* fetchArray
* Convenience method to execute using array fetching as hydration mode.
*
* @param string $params
* @return array
*/
public function fetchArray($params = array()) {
return $this->execute($params, Doctrine::HYDRATE_ARRAY);
}
/**
* fetchOne
* Convenience method to execute the query and return the first item
* of the collection.
*
* @param string $params Parameters
* @param int $hydrationMode Hydration mode
* @return mixed Array or Doctrine_Collection or false if no result.
*/
public function fetchOne($params = array(), $hydrationMode = null)
{
$collection = $this->execute($params, $hydrationMode);
if (count($collection) === 0) {
return false;
}
if ($collection instanceof Doctrine_Collection) {
return $collection->getFirst();
} else if (is_array($collection)) {
return array_shift($collection);
}
return false;
}
/**
* isSubquery
* if $bool parameter is set this method sets the value of
* Doctrine_Query::$isSubquery. If this value is set to true
* the query object will not load the primary key fields of the selected
* components.
*
* If null is given as the first parameter this method retrieves the current
* value of Doctrine_Query::$isSubquery.
*
* @param boolean $bool whether or not this query acts as a subquery
* @return Doctrine_Query|bool
*/
public function isSubquery($bool = null)
{
if ($bool === null) {
return $this->_isSubquery;
}
$this->_isSubquery = (bool) $bool;
return $this;
}
/**
* getAggregateAlias
*
* @param string $dqlAlias the dql alias of an aggregate value
* @return string
* @deprecated
*/
public function getAggregateAlias($dqlAlias)
{
return $this->getSqlAggregateAlias($dqlAlias);
}
/**
* getSqlAggregateAlias
*
* @param string $dqlAlias the dql alias of an aggregate value
* @return string
*/
public function getSqlAggregateAlias($dqlAlias)
{
if (isset($this->_aggregateAliasMap[$dqlAlias])) {
// mark the expression as used
$this->_expressionMap[$dqlAlias][1] = true;
return $this->_aggregateAliasMap[$dqlAlias];
} else if ( ! empty($this->_pendingAggregates)) {
$this->processPendingAggregates();
return $this->getSqlAggregateAlias($dqlAlias);
} else {
throw new Doctrine_Query_Exception('Unknown aggregate alias: ' . $dqlAlias);
}
}
/**
* getDqlPart
* returns a specific DQL query part.
*
* @param string $queryPart the name of the query part
* @return string the DQL query part
* @todo Description: List which query parts exist or point to the method/property
* where they are listed.
*/
public function getDqlPart($queryPart)
{
if ( ! isset($this->_dqlParts[$queryPart])) {
throw new Doctrine_Query_Exception('Unknown query part ' . $queryPart);
}
return $this->_dqlParts[$queryPart];
}
/**
* contains
*
* Method to check if a arbitrary piece of dql exists
*
* @param string $dql Arbitrary piece of dql to check for
* @return boolean
*/
public function contains($dql)
{
return stripos($this->getDql(), $dql) === false ? false : true;
}
public function parseSubquery($subquery)
{
$trimmed = trim($this->_tokenizer->bracketTrim($subquery));
// check for possible subqueries
if (substr($trimmed, 0, 4) == 'FROM' || substr($trimmed, 0, 6) == 'SELECT') {
// parse subquery
$trimmed = $this->createSubquery()->parseDqlQuery($trimmed)->getQuery();
} else {
// parse normal clause
$trimmed = $this->parseClause($trimmed);
}
return '(' . $trimmed . ')';
}
/**
* preQuery
*
* Empty template method to provide Query subclasses with the possibility
* to hook into the query building procedure, doing any custom / specialized
* query building procedures that are neccessary.
*
* @return void
*/
public function preQuery()
{
}
/**
* postQuery
*
* Empty template method to provide Query subclasses with the possibility
* to hook into the query building procedure, doing any custom / specialized
* post query procedures (for example logging) that are neccessary.
*
* @return void
*/
public function postQuery()
{
}
/**
* builds the sql query from the given parameters and applies things such as
* column aggregation inheritance and limit subqueries if needed
*
* @param array $params an array of prepared statement params (needed only in mysql driver
* when limit subquery algorithm is used)
* @return string the built sql query
*/
public function getSqlQuery($params = array())
{
if ($this->_state === self::STATE_DIRTY) {
$this->parse();
}
return $this->_sql;
}
public function parse()
{
$this->reset();
// invoke the preQuery hook
$this->preQuery();
$parser = new Doctrine_Query_Parser($this);
$parser->parse();
if ($parser->isErrors()) {
throw new Doctrine_Query_Parser_Exception(
"Errors were detected during query parsing:\n" .
implode("\n", $parser->getErrors())
);
}
$this->_state = self::STATE_CLEAN;
$this->_sql = $parser->getSql();
}
/**
* count
* fetches the count of the query
*
* This method executes the main query without all the
* selected fields, ORDER BY part, LIMIT part and OFFSET part.
*
* Example:
* Main query:
* SELECT u.*, p.phonenumber FROM User u
* LEFT JOIN u.Phonenumber p
* WHERE p.phonenumber = '123 123' LIMIT 10
*
* The modified DQL query:
* SELECT COUNT(DISTINCT u.id) FROM User u
* LEFT JOIN u.Phonenumber p
* WHERE p.phonenumber = '123 123'
*
* @param array $params an array of prepared statement parameters
* @return integer the count of this query
*/
public function count($params = array())
{
// triggers dql parsing/processing
$this->getQuery(); // this is ugly
// initialize temporary variables
$where = $this->_sqlParts['where'];
$having = $this->_sqlParts['having'];
$groupby = $this->_sqlParts['groupby'];
$map = reset($this->_queryComponents);
$componentAlias = key($this->_queryComponents);
$table = $map['table'];
// build the query base
$q = 'SELECT COUNT(DISTINCT ' . $this->getTableAlias($componentAlias)
. '.' . implode(',', $table->getIdentifierColumnNames())
. ') AS num_results';
foreach ($this->_sqlParts['select'] as $field) {
if (strpos($field, '(') !== false) {
$q .= ', ' . $field;
}
}
$q .= ' FROM ' . $this->_buildSqlFromPart();
// append discriminator column conditions (if any)
$string = $this->_createDiscriminatorConditionSql();
if ( ! empty($string)) {
$where[] = $string;
}
// append conditions
$q .= ( ! empty($where)) ? ' WHERE ' . implode(' AND ', $where) : '';
$q .= ( ! empty($groupby)) ? ' GROUP BY ' . implode(', ', $groupby) : '';
$q .= ( ! empty($having)) ? ' HAVING ' . implode(' AND ', $having): '';
if ( ! is_array($params)) {
$params = array($params);
}
// append parameters
$params = array_merge($this->_params['where'], $this->_params['having'], $params);
$params = $this->convertEnums($params);
$results = $this->getConnection()->fetchAll($q, $params);
if (count($results) > 1) {
$count = 0;
foreach ($results as $result) {
$count += $result['num_results'];
}
} else {
$count = isset($results[0]) ? $results[0]['num_results']:0;
}
return (int) $count;
}
public function setDql($query)
{
$this->_dql = $query;
$this->_state = self::STATE_DIRTY;
}
/**
* query
* query the database with DQL (Doctrine Query Language)
*
* @param string $query DQL query
* @param array $params prepared statement parameters
* @param int $hydrationMode Doctrine::FETCH_ARRAY or Doctrine::FETCH_RECORD
* @see Doctrine::FETCH_* constants
* @return mixed
*/
public function query($query, $params = array(), $hydrationMode = null)
{
$this->setDql($query);
return $this->execute($params, $hydrationMode);
}
/**
* Copies a Doctrine_Query object.
*
* @param Doctrine_Query Doctrine query instance.
* If ommited the instance itself will be used as source.
* @return Doctrine_Query Copy of the Doctrine_Query instance.
*/
public function copy(Doctrine_Query $query = null)
{
if ( ! $query) {
$query = $this;
}
$new = new Doctrine_Query();
$new->_dqlParts = $query->_dqlParts;
$new->_params = $query->_params;
$new->_hydrator = $query->_hydrator;
return $new;
}
/**
* Frees the resources used by the query object. It especially breaks a
* cyclic reference between the query object and it's parsers. This enables
* PHP's current GC to reclaim the memory.
* This method can therefore be used to reduce memory usage when creating a lot
* of query objects during a request.
*
* @return Doctrine_Query this object
*/
public function free()
{
$this->reset();
$this->_parsers = array();
$this->_dqlParts = array();
$this->_enumParams = array();
}
/**
* serialize
* this method is automatically called when this Doctrine_Hydrate is serialized
*
* @return array an array of serialized properties
*/
public function serialize()
{
$vars = get_object_vars($this);
}
/**
* unseralize
* this method is automatically called everytime a Doctrine_Hydrate object is unserialized
*
* @param string $serialized Doctrine_Record as serialized string
* @return void
*/
public function unserialize($serialized)
{
}
}